First scenario I can think of where a backup weapon is needed: Your main carry jams and isn't immediately clearable. Double feed, for example. I don't think a BG is gonna wait for you to clear your weapon.nuparadigm wrote:I can't think of too many applications in which a civilian would need a backup weapon. I know that many on this Forum carry them and it isn't my intention to discourage of demean that practice. For those that do carry them, the backup should be a weapon with which the carrier is competent and comfortable (that is, comfortable with the weapon's ability to stop lethal aggression).
So .... if you're comfortable with the Bond derringer's ability to stop someone/something from their lethal assault and you're good at shot placement with it, then why not carry it?
Another, though less likely situation would be if your main weapon was taken from you. Yes, a less likely but very serious situation such as a hostage or abduction scenario. In such a situation, a BUG would be very useful.
In answer to your question... people don't tend to be very good at shot placement under the stress of a self-defense situation without a lot of specific training. Sure, you may get a good shot and only need one. I wouldn't want to limit myself to 2 rounds when my life is on the line, though.